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Reductive dechlorination of nonachlorobiphenyls and selected octachlorobiphenyls by microbial enrichment cultures

TitleReductive dechlorination of nonachlorobiphenyls and selected octachlorobiphenyls by microbial enrichment cultures
Publication TypeJournal Article
Year of Publication1999
AuthorsKuipers, B, Cullen, WR, Mohn, WW
JournalEnvironmental Science & Technology
Volume33
Pagination3579-3585
Date PublishedOct
Type of ArticleArticle
ISBN Number0013-936X
KeywordsANAEROBIC MICROORGANISMS, AROCLORS, CONGENERS, DECHLORINATION, ESTUARINE SEDIMENTS, POLYCHLORINATED-BIPHENYLS, REDUCTIVE, SLURRIES
Abstract

The anaerobic dechlorination of four octachlorobiphenyls [2,3,4,5,6,2’,3’,4’-octachlorobiphenyl (23456-234-octaCB), 2345-2346-octaCB, 2345-2356-octaCB, and 23456-245-octaCB] and three nonachlorobiphenyls [23456-2345-nonaCB, 23456-2346-nonaCB, and 23456-2356-nonaCB] was investigated. The single congeners were added to two different previously studied microbial enrichment cultures, and the cultures were monitored over a period of 16 weeks. All seven congeners were reductively dechlorinated. The predominant dechlorination patterns for all congeners, in both cultures, showed meta-dechlorination of doubly flanked m-chlorines followed by meta-dechlorination of singly flanked m-chlorines. Some ortho- and para-dechlorination was also observed. All congeners had an initial concentration of 50 ppm in soil, and the extent of dechlorination over the 16-week period varied widely, from 38% dechlorination of congener 23456-245-octaCB to only 1.4% removal of congener 23456-2345-nonaCB.

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